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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873919b5887e51c5ace0780ff3d1ed96425d723a7092ff6d9663013cbf61fae6' 
  AND token = 'jlk+qIsQ6H1sxjcUNvBqnw4LvNpE/QMdRa665GsB874=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}